 var sp1 = document.querySelector('.main-5-sp1');
 var sp2 = document.querySelector('.main-5-sp2');

 sp1.ontouchstart = function(){
     this.style.color =  '#FF8A00';
     this.style.borderBottom = '3px solid #FF8A00';
     sp2.style.color = '#666';
     sp2.style.borderBottom = 'none';
     console.log(111);
 }
 sp2.ontouchstart = function(){
    this.style.color =  '#FF8A00';
    this.style.borderBottom = '3px solid #FF8A00';
    sp1.style.color = '#666';
    sp1.style.borderBottom = 'none';
}